Practice: Chop the onion and ginger (in large quantities), chop the frozen crab into pieces, heat the oil in the pot, stir-fry the onion and ginger, stir-fry the crab pieces until they change color, add soy sauce, salt and sugar, simmer for 3 minutes on low fire, and collect the juice. When there is a little soup in the pot, let the soup be evenly wrapped.